Recombination system, method, apparatus and storage medium for multiple separation angle slit light paths

Abstract

The present application relates to multi-angle hyperspectral imaging system technical field, especially to a kind of multi-separation angle slit light path recombination system, method, equipment and storage medium;The system includes telescopic objective module, multi-slit recombination module, multi-slit array module sequentially distributed along optical axis;Wherein: telescopic objective module is used to take in the parallel light beam in multiple separation angle field of view;Multi-slit array module includes reference slit and off-axis slit mutually parallel arrangement along meridian direction;Multi-slit recombination module is used to compress the off-axis distance between off-axis slit light path and reference slit light path along meridian direction;Multi-slit recombination module includes reference folding mirror group for folding reference slit light path and off-axis folding mirror group for folding off-axis slit light path.The present application can obtain multiple separation angle spectral information by single lens, while ensuring each observation angle is substantially wide, avoids the use of large specification detector and moving parts.

Description

Technical Field

[0001] This invention belongs to the technical field of multi-angle hyperspectral imaging systems, and particularly relates to a reconstruction system, method, device and storage medium for multi-separation angle slit optical paths. Background Technology

[0002] Spectral information from multiple separation angles can more accurately separate the contributions of surface reflection and atmospheric scattering, reducing errors caused by prior models of the target; it improves the inversion accuracy of parameters with dual-phase reflectance characteristics, such as aerosol shape, particle size and other physical characteristics, cloud top height, cloud phase, vegetation canopy, leaf area index, and chlorophyll content.

[0003] To date, various technologies for acquiring multi-separation-angle spectral information have been developed and applied, but all have corresponding limitations. For example:

[0004] SpexOne employs five independent off-axis three-mirror telescopes, using a plane grating to simultaneously acquire hyperspectral information from five angles. The disadvantages of this multi-objective stitching method are: a sharp increase in size and mass with increasing orbital altitude; and the sacrifice of swath width at each observation angle to avoid using a large-scale detector, resulting in a swath width of only 100 km.

[0005] CHRIS utilizes the four reaction wheels of its PROBA satellite platform to achieve time-sharing acquisition of multispectral information from five angles of the same target by rotating along the orbit and perpendicular to the orbit. However, this observation method using satellite platform rotation is not suitable for targets that are prone to changes over time within the time frame constituting the multi-angle dataset; furthermore, it requires rigorous sampling, registration, and atmospheric correction, making data preprocessing difficult. The presence of moving parts also leads to poor stability during long-term on-orbit operation and a tendency for accuracy to degrade.

[0006] ATSR-2 uses a multi-angle observation method to acquire multispectral information from two angles: nadir (0°) and forward (55°). The disadvantages of this method, which uses a oscillating mirror, are: it requires time-sharing observation, has a significant response delay, cannot adapt to rapidly changing targets, and has limited time resolution; in addition, the mechanical rotation is easily affected by orbital disturbances and vibrations, which can cause significant shifts or jitter in the observation angle and poor data consistency.

[0007] It is evident that existing technical solutions cannot simultaneously acquire spectral information from multiple angles using only a single lens and without moving parts. Summary of the Invention

[0008] In view of this, the present invention aims to provide a multi-slit reconstruction module, method and reconstruction system of multi-separation angle slit optical paths, so as to ensure a wide amplitude of each observation angle while avoiding the use of large-scale detectors, and to acquire spectral information of multiple separation angles simultaneously with only a single lens and no moving parts.

[0009] To achieve the above objectives, the technical solution created by this invention is implemented as follows:

[0010] In a first aspect, the present invention provides a reconstruction system for multi-slit optical paths with multiple separation angles, comprising a telescope objective module, a multi-slit reconstruction module, and a multi-slit array module sequentially distributed along the optical axis; wherein:

[0011] The telescope objective module is used to capture parallel beams within multiple separate angle fields of view.

[0012] The multi-slit array module includes a reference slit and an off-axis slit arranged parallel to each other along the meridional direction;

[0013] The multi-slit reconstruction module is used to compress the off-axis spacing along the meridional direction between the off-axis slit optical path and the reference slit optical path; the multi-slit reconstruction module includes a reference folding mirror group for folding the reference slit optical path and an off-axis folding mirror group for folding the off-axis slit optical path;

[0014] Wherein, the off-axis slit optical path is the optical path that exits from the telescope objective module and enters the off-axis slit; the reference slit optical path is the optical path that exits from the telescope objective module and enters the reference slit.

[0015] Furthermore, the reference folding lens group is used to make the exit pupil center of the reference slit optical path located on the optical axis, and to make the optical path of the principal ray of the reference slit optical path equal before and after folding;

[0016] The off-axis folding mirror assembly is used to make the distance between the exit pupil center of the off-axis slit optical path and the exit pupil center of the reference slit optical path zero, and to make the optical path length of the principal ray of the off-axis slit optical path equal before and after folding.

[0017] Furthermore, the reference folding mirror group includes a first plane mirror, a second plane mirror, a third plane mirror, and a fourth plane mirror defined sequentially according to the order of light propagation; the centers of the first plane mirror and the fourth plane mirror are located on the optical axis and satisfy the formula:

[0018]

[0019] in, It is the angle between the first plane mirror and the second plane mirror; It is the angle between the second plane mirror and the third plane mirror; It is the angle between the third plane mirror and the fourth plane mirror; It is the angle between the incident ray from the first plane mirror and the outgoing ray from the second plane mirror; It is the angle between the incident ray from the second plane mirror and the ray emitted from the third plane mirror; It is the angle by which the first plane mirror rotates counterclockwise; It is the angle of the second plane mirror's counterclockwise rotation; It is the angle of clockwise rotation of the third plane mirror; It is the angle of clockwise rotation of the fourth plane mirror.

[0020] Furthermore, the off-axis folding mirror group includes a fifth plane mirror and a sixth plane mirror defined sequentially according to the order of light propagation;

[0021] When the fifth and sixth plane mirrors rotate clockwise respectively 1 、 At time 2, the principal ray of the off-axis slit optical path is incident at the sixth plane mirror at an angle of incidence. i 5 (λ 0 ) Satisfying the formula:

[0022]

[0023]

[0024] in, i 4 (λ 0 ) The incident angle of the principal ray of the off-axis slit optical path at the fifth plane mirror; i 6 (λ 0 ) The incident angle of the principal ray of the off-axis slit optical path on the primary image plane; lns The distance from the slit to the axis. L E This is the exit pupil distance.

[0025] Secondly, the present invention provides a method for reconstructing multi-separation-angle slit optical paths, applied to the multi-separation-angle slit optical path reconstruction system provided by the present invention, comprising:

[0026] S10. Establish the first constraint condition based on the fact that the exit pupil positions of the reference slit optical path and the off-axis slit optical path are consistent.

[0027] S20. Establish a second constraint condition that enables the off-axis slit optical path to simultaneously satisfy image plane consistency and optical path consistency.

[0028] S30. Establish a third constraint condition that enables the reference slit optical path to simultaneously satisfy image plane consistency and optical path consistency.

[0029] S40. Ensure that the structural parameters of the multi-slit reassembly module simultaneously satisfy the first constraint, the second constraint, and the third constraint.

[0030] Furthermore, after step S40, the method further includes step S50: determining the rationality of the structural parameters of the multi-slit reconstruction module based on the integrity of the exit pupil of the reconstructed optical path.

[0031] Furthermore, step S20 specifically includes:

[0032] The image plane consistency constraint of the second constraint condition is established based on the fact that the sum of the axial distances of all segments of the off-axis slit optical path is equal to the sum of the axial distances of all segments of the reference slit optical path.

[0033] The optical path consistency constraint in the second constraint condition is established based on the consistency of the optical path of the off-axis slit optical path before and after being folded by the multi-slit reconstruction module.

[0034] The plane mirror rotation constraint in the second constraint condition is established based on the change in the incident angle of the off-axis slit optical path caused by the rotation of the fifth and sixth plane mirrors in the multi-slit reconstruction module.

[0035] Furthermore, step S30 specifically includes:

[0036] The image plane consistency constraint in the third constraint condition is established by the total projection length of the reference slit optical path in the optical axis direction.

[0037] The optical path consistency constraint in the third constraint condition is established by ensuring that the optical path of the reference slit optical path is consistent before and after being folded by the multi-slit reconstruction module.

[0038] The angle constraint in the third constraint condition is established by setting the offset angle between the incident and outgoing rays of the reference slit optical path relative to the optical axis to 0.

[0039] Thirdly, the present invention provides a computer device comprising:

[0040] At least one processor; and

[0041] A memory communicatively connected to the at least one processor; wherein,

[0042] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the reassembly method of the multi-separation angle slit optical path described above.

[0043] Fourthly, the present invention provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the multi-separation angle slit optical path reconstruction method described in any of the preceding claims.

[0044] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0045] (1) Without the aid of moving parts, spectral information of multiple separation angles can be obtained through a single lens, and there is no need for multiple telescope objectives or multiple sensors to be stitched together. The hyperspectral information of multiple large separation angle fields of view can be obtained simultaneously through a single lens without moving parts.

[0046] (2) While ensuring that the distance after slit reconstruction is greater than the required spectral dispersion range, the redundant space on the detector surface is compressed, thus avoiding the use of large-scale detectors.

[0047] (3) It can simultaneously accommodate long focal length and large angle separation field of view, which helps to increase the orbital height, increase the observation width of each slit field of view, and acquire field of view information of multiple large separation angles at the same time. Attached Figure Description

[0048] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0049] Figure 1 A schematic diagram of the structure of the multi-separation-angle slit optical path reconstruction system described in the embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the structure of the multi-separation-angle slit optical path reconstruction system according to another embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of the optical path of the reference folding mirror group in the multi-slit reconstruction module described in the embodiment of the present invention;

[0052] Figure 4 Optical path diagram of the off-axis folding mirror group in the multi-slit reconstruction module described in the embodiments of the present invention;

[0053] Figure 5(a) is a schematic diagram of the exit pupil positions of the reference slit optical path and the off-axis slit optical path according to the embodiment of the present invention;

[0054] Figure 5(b) is a schematic diagram showing that the exit pupil of the reference slit optical path and the off-axis slit optical path are consistent in the embodiment of the present invention;

[0055] Figure 6 A schematic flowchart of the method for reconstructing multi-separation-angle slit optical paths as described in the embodiments of the present invention;

[0056] Figure 7 A schematic flowchart illustrating the method for reconstructing a multi-separation-angle slit optical path according to another embodiment of the present invention;

[0057] Figure 8 A schematic diagram of the multi-slit array module layout described in an embodiment of the present invention;

[0058] Figure 9 A schematic diagram illustrating the integrity of the pupil of the multi-slit reassembly module described in an embodiment of the present invention;

[0059] Figure 10 A schematic diagram of the structure of the computer device described in the embodiment of the present invention.

[0060] Explanation of reference numerals in the attached figures:

[0061] 11. First plane mirror; 12. Second plane mirror; 13. Third plane mirror; 14. Fourth plane mirror; 15. Fifth plane mirror; 16. Sixth plane mirror; 21. Reference folding mirror group; 22. Positive order folding mirror group; 23. Negative order folding mirror group; 30. Optical axis; 31. Last lens element of the telescope objective module; 32. First image plane; 33. Exit pupil center of the off-axis slit optical path; 34. Exit pupil center of the reference slit optical path; 40. Aperture stop; 41. Telescope objective module; 42. Multi-slit reconstruction module ; 43. Multi-slit array module; 44. Collimation system; 45. Prism group; 46. Converging imaging system; 47. Photodetector; 62. Computer equipment; 64. External equipment; 66. Processing unit; 68. Bus; 70. Network adapter; 72. Input / output (I / O) interface; 74. Display; 78. System memory; 80. Random access memory (RAM); 82. Cache memory; 84. Storage system; 92. Program module; 90. Program / utility. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and do not constitute a limitation thereof. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the invention. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the invention are not shown or described in the specification. This is to avoid obscuring the core parts of the invention with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0063] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined to form various implementations. Furthermore, the order of the steps or actions in the method description can be changed or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various orders in the specification and drawings are merely for the clear description of a particular embodiment and do not imply a mandatory order, unless otherwise stated that a particular order must be followed.

[0064] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. The term "based on" should be understood as "at least partially based on." Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, and the term "including" means "including but not limited to." Various embodiments of the present invention may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range; for example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the range referred to.

[0065] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0066] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0067] Example 1

[0068] like Figure 1As shown, the present invention provides a reconstruction system for a multi-slit optical path with multiple separation angles, including a telescope objective system 41, a multi-slit reconstruction module 42, and a multi-slit array module 43 arranged sequentially along the optical axis (Z-axis).

[0069] In front of the telescope objective system 41 is the aperture stop 40 of the entire system. Parallel light with a large separation field of view (parallel beams with three different fields of view are shown in the figure) first passes through the aperture stop 40, and then the telescope objective system 41 captures parallel beams in multiple separation angle fields of view. The multi-slit recombination module 42 folds the optical path to recombine the off-axis spacing of the multi-slits, and then emits it through the multi-slit array module 43.

[0070] More specifically, the telescope objective system 41 images parallel beams in multiple discrete field angles on the Y-axis (meridian direction) and in the sagittal direction (X-axis, which is the length direction of the slits; since the X-axis direction is perpendicular to the plane and inward, it is not shown in the figure). The three slits located at the image plane serve as field stops.

[0071] The multi-slit array module 43 includes a reference slit and an off-axis slit arranged parallel to each other along the meridional direction, and the reference slit and the off-axis slit have equal lengths. The off-axis slit consists of a positive-order slit and a negative-order slit symmetrically disposed on both sides of the reference slit. In this embodiment, the positive-order slit and the negative-order slit are a +1-order slit and a -1-order slit.

[0072] In this invention, the off-axis slit optical path mainly refers to the ±1st order slit optical path; of course, the off-axis slit optical path can also include the ±1st order slit optical path, the ±2nd order slit optical path, the ±3rd order slit optical path, etc. In all embodiments of this invention, the off-axis slit optical path is described using the positive order (+1st order) slit optical path as an example.

[0073] In this embodiment, the off-axis slits only include ±1 order slits. Therefore, the multi-slit array module 43 is composed of three slits of equal length. At this time, the central slit among the three slits arranged along the Y-axis is called the reference slit, which is located on the optical axis. The off-axis slits arranged on the upper and lower sides along the Y-axis are named positive order slits (+1 order slits) and negative order slits (-1 order slits) respectively according to their distance from the central slit.

[0074] Due to the long focal length and large separation field of view in the Y direction of the telescope objective, the original ±1st order slit optical paths and the reference slit optical path have a huge off-axis distance in the Y direction. Without the addition of the multi-slit recombination module 42 to fold the ±1st order slit optical paths and the reference slit optical path, this huge geometric gap will result in a large ineffective blank area between the dispersive spectral bands of different slits on the photodetector surface, i.e., a large redundancy space between the spectral bands of different slits. This not only severely reduces the target surface utilization of the detector, but may even cause the spectral distribution range to exceed the effective photosensitive surface size of a single detector.

[0075] In this embodiment, the multi-slit reconstruction module 42 is placed between the telescope objective system 41 and the multi-slit array module 43 to reduce the large off-axis distance along the Y-axis between the ±1st order slit optical paths and the reference slit optical path.

[0076] The multi-slit reconstruction module 42 includes a reference folding mirror group 21 and an off-axis folding mirror group, wherein the off-axis folding mirror group includes a positive-order folding mirror group 22 and a negative-order folding mirror group 23 that are mirrored in the plane where the optical axis is located; the reference folding mirror group 21 is used to fold the reference slit optical path, the positive-order folding mirror group 22 is used to fold the positive-order slit optical path, and the negative-order folding mirror group 23 is used to fold the negative-order slit optical path.

[0077] In other words, the optical path corresponding to the positive-order slit is folded by a positive-order folding mirror group 22 composed of two plane mirrors, ensuring that the optical path of the positive-order slit exits from the positive-order folding mirror group 22 and enters the positive-order slit in the multi-slit array module 43. The optical path corresponding to the negative-order slit is folded by a negative-order folding mirror group 23 composed of two plane mirrors, ensuring that the optical path of the negative-order slit exits from the negative-order folding mirror group 23 and enters the negative-order slit in the multi-slit array module 43. The optical path corresponding to the reference slit is folded by a reference folding mirror group with a "bridge structure" composed of four plane mirrors, ensuring that the optical path of the reference slit enters the reference folding mirror group along the optical axis, exits from the reference folding mirror group along the optical axis, and enters the reference slit in the multi-slit array module 43, and the reference slit optical path has the same image plane position as the ±1 order slit optical path.

[0078] It should be noted that when using the multi-slit reconstruction module to compress the off-axis spacing of the slits, it is necessary to ensure that the distance between each slit is greater than the required spectral dispersion range to prevent the adjacent spectral images generated by each slit from overlapping.

[0079] The multi-slit reconstruction module 42 provided by this invention can avoid excessive off-axis distances between the positive and negative slit optical paths on the Y-axis (meridian direction) and the reference slit optical path located on the optical axis, caused by the long focal length and large-angle separation field of view of the telescope objective system. In other words, the multi-slit reconstruction module 42 can reduce the off-axis distances between the positive and negative slit optical paths on the Y-axis and the reference slit optical path located on the optical axis. Here, the Y-axis direction refers to the direction perpendicular to the optical axis (Z-axis).

[0080] Example 2

[0081] like Figure 2 As shown, this invention provides a reconstruction system for multi-slit optical paths with multiple separation angles, comprising a telescope objective system 41, a multi-slit reconstruction module 42, a multi-slit array module 43, a collimation system 44, a prism group 45, a converging imaging system 46, and a photodetector 47, sequentially distributed along the optical axis (Z-axis). The telescope objective system 41, the multi-slit reconstruction module 42, and the multi-slit array module 43 are the same as in Embodiment 1, and will not be described again here.

[0082] In this embodiment, the telescope objective system 41 captures parallel beams within multiple separated angular fields of view. The multi-slit recombination module 42 folds the optical path to recombine the off-axis spacing of the multiple slits. The collimation system 44 then collimates the beams passing through the ±1st order slits and the reference slit, forming parallel beams at different angles. These parallel beams at different angles then pass through a planar prism group 45 composed of two different materials. Since each slit is aligned parallel to the dispersion direction of the prism group, the parallel beams at different angles will disperse along the Y-axis according to their wavelength. The dispersed beams distributed along the Y-axis are then imaged by the converging imaging system 46, directly mapping onto the image plane of the photodetector 47, each corresponding to a reference spacing between the spectral bands of different slits. The photodetector 47 can obtain hyperspectral information for all observation angles. In this embodiment, the hyperspectral information includes positive order observation angle spectral information, reference observation angle spectral information, and -1st order observation angle spectral information.

[0083] Example 3

[0084] Based on any of the above embodiments, please also refer to Figure 3As shown in Figure 5(b), the multi-slit reconstruction module 42 in the multi-separation-angle slit optical path reconstruction system provided by the present invention includes a reference folding mirror group 21 and an off-axis folding mirror group. The reference folding mirror group 21 includes a first plane mirror 11, a second plane mirror 12, a third plane mirror 13, and a fourth plane mirror 14, defined sequentially according to the order of light propagation. The off-axis folding mirror group includes a positive-order folding mirror group 22 and a negative-order folding mirror group 23, mirrored along the plane of the optical axis. More specifically, the positive-order folding mirror group 22 and the negative-order folding mirror group 23 are arranged in a mirror-symmetrical manner with the plane of the optical axis as the plane of symmetry. The positive-order folding mirror group 22 includes a fifth plane mirror 15 and a sixth plane mirror 16, defined sequentially according to the order of light propagation; its corresponding off-axis slit optical path is a positive-order slit optical path.

[0085] The centers of the first plane mirror 11 and the fourth plane mirror 14 are located on the optical axis, and the reference folding mirror group 21 satisfies the formula:

[0086]

[0087] in, It is the angle between the first plane mirror and the second plane mirror; It is the angle between the second plane mirror and the third plane mirror; It is the angle between the third plane mirror and the fourth plane mirror; It is the angle between the incident ray from the first plane mirror and the outgoing ray from the second plane mirror; It is the angle between the incident ray from the second plane mirror and the ray emitted from the third plane mirror; It is the angle by which the first plane mirror rotates counterclockwise; It is the angle of the second plane mirror's counterclockwise rotation; It is the angle of clockwise rotation of the third plane mirror; It is the angle of clockwise rotation of the fourth plane mirror.

[0088] When the fifth plane mirror 15 and the sixth plane mirror 16 in the positive order folding mirror group 22 rotate clockwise respectively 1 、 When 2, the formula is satisfied:

[0089]

[0090]

[0091] in, i 4 (λ 0 ) The incident angle of the principal ray of the off-axis slit optical path at the fifth plane mirror; i 6 (λ 0 ) The incident angle of the principal ray of the off-axis slit optical path on the primary image plane; lns The distance from the slit to the axis. L E This is the exit pupil distance.

[0092] Example 4

[0093] like Figure 6 As shown, the present invention provides a method for reconstructing multi-separation-angle slit optical paths, applicable to the multi-separation-angle slit optical path reconstruction system provided in any embodiment of the present invention, comprising the following steps:

[0094] S10. Establish the first constraint condition based on the fact that the exit pupil positions of the reference slit optical path and the off-axis slit optical path are consistent.

[0095] Please refer to the following at the same time Figure 5(a) and 5(b) First, ensure that the exit pupil center 34 of the reference slit optical path after folding is located on the optical axis 30. Second, to ensure the spectrometer system can receive beams with a uniform aperture, the exit pupil center 33 of the folded off-axis slit optical path (shown in the figure as the +1st order slit optical path) needs to be aligned with the exit pupil center 34 of the reference slit optical path. This means that the backward extension of the principal ray of the folded off-axis slit optical path passes through the exit pupil center 34 of the reference slit optical path, thus ensuring that the distance between the exit pupil centers of different slits is 0, satisfying the exit pupil alignment constraint for different slits. The principal ray of the folded off-axis slit optical path refers to the principal ray of the off-axis slit optical path (±1st order slit optical path) imaged onto the corresponding image point on the primary image plane 32 after being folded by two mirrors (the fifth plane mirror 15 and the sixth plane mirror 16).

[0096] The constraint formula established for the incident angle of the principal ray in the off-axis slit path at the first image plane is the first constraint condition:

[0097] (1)

[0098] in, i 6 represents the rotation angle of the fifth and sixth plane mirrors. lns The distance from the slit to the axis. L E This is the exit pupil distance. The rotation angles of the fifth and sixth plane mirrors are controlled. i 6. Make the backward extension of the principal ray of the off-axis slit image point pass through the exit pupil center of the reference slit optical path.

[0099] S20. Establish a second constraint condition that enables the off-axis slit optical path to simultaneously satisfy image plane consistency and optical path consistency.

[0100] Please refer to the following at the same time Figure 4 In specific implementation, steps S21, S22, and S23 may be included, and there is no sequential relationship between steps S21, S22, and S23.

[0101] S21. Establish the image plane consistency constraint of the second constraint condition based on the fact that the sum of the axial distances of all segments of the off-axis slit optical path is equal to the sum of the axial distances of all segments of the reference slit optical path; wherein, the sum of the axial distances of all segments is the axial distance between the exit point of the principal ray of the off-axis slit optical path (or the reference slit optical path) and its image point on the primary image plane.

[0102] More specifically, let point U be the exit point of the principal ray of the off-axis slit optical path from the rear surface of the last lens 31 of the telescope objective module. The rotation angles of the fifth plane mirror 15 and the sixth plane mirror 16 are respectively... 1 、 2. The axial distance L between the center of the fifth plane mirror 15 and point U. 11 Let L2 be the axial distance between the fifth plane mirror 15 and the sixth plane mirror 16, and L3 be the axial distance between the sixth plane mirror 16 and the primary image plane. L1' is the optical path length from point U to the fifth plane mirror 15; L2' is the optical path length from the fifth plane mirror 15 to the sixth plane mirror 16; and L3' is the optical path length from the sixth plane mirror 16 to the primary image plane 32. The relationship between the off-axis slit optical path and the corresponding axial distance is shown below:

[0103] (2)

[0104] Where h is the structural height parameter vector, defining the geometric parameters of the relative positions of the key nodes of the fifth plane mirror 15 and the sixth plane mirror 16 in the vertical direction (Y-axis direction). h1 is the vertical height of point U relative to the center of the fifth plane mirror 15; h2 is the vertical height of the image point position relative to point U; h3 is the vertical height of the image point position relative to the center of the sixth plane mirror 16.

[0105] Matrix A describes the topological relationship between "structural position (the position of the fifth plane mirror 15 and the sixth plane mirror 16)" and "the actual vertical distance traversed by the light rays"; y is the vertical span vector, representing the actual vertical distance traversed by the light rays on each of the three propagation paths.

[0106] To establish image plane consistency constraints, the sum of the axial distances of all segments of the off-axis slit optical path must equal the sum of the axial distances of all segments of the reference slit optical path (i.e., BFL). Define the axial projection transformation matrix. C is used to convert the vertical span (y) of a light ray into a horizontal axial distance (L). L is a piecewise axial distance vector, where the three elements represent the projected lengths of the three light paths on the optical axis (Z-axis). The expressions for C and L are as follows:

[0107] (3)

[0108] (4)

[0109] in, i 4 (λ 0 ) The angle of incidence of the principal ray of the off-axis slit optical path at the fifth plane mirror; i 5 (λ 0 ) The angle of incidence of the principal ray of the off-axis slit optical path on the sixth plane mirror; i 6 (λ 0 ) The incident angle of the principal ray of the off-axis slit optical path on the primary image plane is denoted as .

[0110] More specifically, i 4 (λ 0 ) It is known that the angle between the principal ray of the positive order field of view, after exiting the end of the telescope objective (point U) and striking the fifth plane mirror, and the optical axis. It represents the initial tilt of the field of view angle corresponding to the off-axis slit relative to the optical axis in the YZ plane of image space before the optical path is folded. i 5 (λ 0 ) The inter-mirror transmission angle is the angle between the optical axis (horizontal dashed line) and the ray that travels from the principal ray after reflection by the fifth plane mirror to the sixth plane mirror. It describes the direction of light propagation between two plane mirrors in an off-axis folding mirror assembly. i 6 (λ 0 ) It is the final image plane incident angle, which is the angle between the principal ray, after being reflected by the sixth plane mirror, and the optical axis of the ray that strikes the telescope's primary image plane. It is the output angle of the off-axis folding mirror group. It is usually constrained by "exit pupil coherence" (i.e., the backward extension of the ray must pass through the center of the exit pupil of the reference optical path) and determines the angle at which the ray enters the subsequent collimation system.

[0111] The residual equation (i.e., the image plane consistency constraint in the second constraint condition) between the sum of the axial distances in the Z-axis direction of the off-axis slit optical path after it has been folded by the multi-slit reconstruction module and the sum of the axial distances of all segments of the system's reference slit is expressed as:

[0112] (5)

[0113] (6)

[0114] (7)

[0115] Where BFL is the axial distance between point U and the image plane. h 3 is the vertical height difference between the image point position and the center of the sixth plane mirror 16. h 4 is the vertical height of the sixth plane mirror 16 from the optical axis.

[0116] S22. Establish the optical path consistency constraint in the second constraint condition based on the consistency of the optical path of the off-axis slit optical path before and after being folded by the multi-slit reconstruction module; wherein, the optical path is the total optical path of the main ray of the off-axis slit optical path from the exit point through the fifth plane mirror, the sixth plane mirror and down to the primary image plane.

[0117] To ensure that the image quality remains unchanged before and after folding, the optical path of the principal ray is equal before and after folding. Based on geometric relationships, we can obtain:

[0118] (8)

[0119] (9)

[0120] in, This is the optical path projection transformation matrix, used to convert the perpendicular span (y) of a ray into the actual geometric optical path (y). ). It is a piecewise geometric optical path vector, where the three elements of the vector represent the actual geometric distances that the light ray travels along the three paths.

[0121] The total geometric optical path of a positive-order optical path after the addition of the fifth and sixth plane mirrors must be strictly equal to the optical path S1 before the addition of the folding structure. We express this requirement to prevent defocusing as a residual equation for each segment of the optical path (i.e., the optical path consistency constraint in the second constraint condition):

[0122] (10)

[0123] (11)

[0124] Wherein, S1 (a known quantity) represents the geometric optical path distance of the off-axis slit optical path from the last surface at the end of the telescope objective system to the image plane of the telescope objective system without passing through the folded optical path of the fifth and sixth plane mirrors.

[0125] S23. Based on the change in the incident angle of the off-axis slit optical path caused by the rotation of the fifth and sixth plane mirrors in the multi-slit reassembly module, establish the plane mirror rotation constraint in the second constraint condition.

[0126] When the fifth and sixth plane mirrors rotate clockwise respectively 1. At time 2, according to the geometric relationship (the plane mirror rotation constraint in the second constraint condition):

[0127] (12)

[0128] S30. Establish a third constraint condition that enables the reference slit optical path to simultaneously satisfy image plane consistency and optical path consistency.

[0129] Please refer to the following at the same time Figure 3 In specific implementation, steps S31, S32, and S33 may be included, and there is no sequential relationship between steps S31, S32, and S33.

[0130] S31. Establish the image plane consistency constraint in the third constraint condition by using the total projection length of the reference slit optical path in the optical axis direction;

[0131] More specifically, to ensure the exit pupil remains on the optical axis after folding the optical path, both the incident and outgoing rays must have an angle of deviation from the optical axis of 0. Therefore, the centers of the first and fourth plane mirrors are both located on the optical axis. Since the first-order image plane positions of different slit optical paths are inconsistent (i.e., some image planes are in front and some are behind), it means they cannot be simultaneously focused on the same flat detector target surface after passing through the spectrometer system. Therefore, it is essential to ensure that the ±1st-order slit optical paths after folding the optical path converge at the same image plane position (i.e., the back intercept (BFL) is consistent).

[0132] In this embodiment, a structural height vector H is defined, which represents the vertical height difference crossed by light rays along the three core paths of the "bridge" structure. Wherein, This refers to the lifting height of the first segment of the optical path (from the first plane mirror 11 to the second plane mirror 12). That is, the height difference between the first plane mirror 11 and the second plane mirror 12 in the Y-axis direction. This represents the height difference between the second optical path segment (from the second plane mirror 12 to the third plane mirror 13). In an asymmetric structure, the heights of the second plane mirror 12 and the third plane mirror 13 may differ, and this term describes the degree of inclination of the "bridge top"; in an ideally symmetric structure, this term is usually 0. This refers to the descent height of the third optical path segment (from the third plane mirror 13 to the fourth plane mirror 14). Specifically, it represents the height difference between the third plane mirror 13 and the fourth plane mirror 14 (typically located on the optical axis). Definition is the axial projection coefficient vector, used to construct the cofocal plane imaging constraint (BFLConsistency). u is defined as the optical path coefficient vector, used to construct the optical path constraint (Iso-Optical-Pathconstraint).

[0133] (13)

[0134] in, It is the angle of the first plane mirror 11 rotating counterclockwise; The angle of counterclockwise rotation of the second plane mirror 12; It is the angle of clockwise rotation of the third plane mirror 13; It is the angle of clockwise rotation of the fourth plane mirror 14.

[0135] Through vector dot product This allows for the rapid calculation of the total projected length of the light ray along the Z-axis, thereby determining whether the image plane position meets the requirements. The corresponding formula (i.e., the image plane consistency constraint in the third constraint condition) is shown below:

[0136] (14)

[0137] (15)

[0138] in, l 1 is the distance along the optical axis from the center of the last lens of the telescope objective to the first plane mirror 11; l 2 is the axial distance from the first plane mirror 11 to the second plane mirror 12; l 3 is the axial distance from the second plane mirror 12 to the third plane mirror 13; l 4 is the axial distance between the third plane mirror 13 and the fourth plane mirror 14; l 5 is the distance along the optical axis from the fourth plane mirror 14 to the primary image plane 32.

[0139] S32. Establish the optical path consistency constraint in the third constraint condition by ensuring that the optical path of the reference slit optical path is consistent before and after being folded by the multi-slit reconstruction module.

[0140] In practical implementation, vector dot product can be used. The total geometric optical path of the folded optical path can be directly calculated, ensuring that it is equal to the original design optical path (equal optical path constraint), thereby guaranteeing that the MTF (imaging quality) does not decrease. The corresponding expression (i.e., the optical path consistency constraint in the third constraint condition) is as follows:

[0141] (16)

[0142] (17)

[0143] in, l 2' is the optical path length of the light from the first plane mirror 11 to the second plane mirror 12; l 3' is the optical path length of the light from the second plane mirror 12 to the third plane mirror 13; l4' is the optical path length of the light from the third plane mirror 13 to the fourth plane mirror 14.

[0144] (A known quantity) represents the geometric optical path distance from the last surface at the end of the telescope objective system to the image plane of the telescope objective system in the state where the reference slit optical path has not passed through the folded optical path of the four plane mirrors.

[0145] The aforementioned requirement of equal optical path length (consistent optical path length before and after folding) applies to both the reference slit optical path and the ±1st order slit optical paths. Specifically, this constraint means that each optical path independently satisfies the condition that "the total optical path length after folding is equal to the original optical path length in the folded state." This is to prevent axial defocusing due to changes in optical path length and to maintain the original design's MTF (modulation transfer function) and imaging quality.

[0146] S33. The angle constraint in the third constraint condition is established by making the offset angle between the incident light and the outgoing light of the reference slit optical path relative to the optical axis 0.

[0147] When the angle of deviation of the incident and outgoing rays of the reference folding mirror group relative to the optical axis is 0, the following holds true:

[0148] (18)

[0149] in, It is the angle between the first plane mirror 11 and the second plane mirror 12; It is the angle between the second plane mirror 12 and the third plane mirror 13; It is the angle between the third plane mirror 13 and the fourth plane mirror 14; It is the angle between the incident ray from the first plane mirror 11 and the outgoing ray from the second plane mirror 12; It is the angle between the incident ray from the second plane mirror 12 and the ray exiting from the third plane mirror 13. According to geometric relationships (the angle constraint in the third constraint condition):

[0150] (19)

[0151] Example 5

[0152] Based on Embodiment 4 above, this embodiment provides a method for reconstructing multi-separation-angle slit optical paths, applicable to the multi-separation-angle slit optical path reconstruction system provided in any embodiment of this invention. The method includes the following steps:

[0153] S10. Establish the first constraint condition based on the fact that the exit pupil positions of the reference slit optical path and the off-axis slit optical path are consistent.

[0154] S20. Establish a second constraint condition that enables the off-axis slit optical path to simultaneously satisfy image plane consistency and optical path consistency.

[0155] S30. Establish a third constraint condition that enables the reference slit optical path to simultaneously satisfy image plane consistency and optical path consistency.

[0156] S40. Ensure that the structural parameters of the multi-slit reassembly module simultaneously satisfy the first constraint, the second constraint, and the third constraint.

[0157] S50. Determine the rationality of the structural parameters of the multi-slit reconstruction module based on the integrity of the exit pupil of the reconstructed optical path.

[0158] Steps S10 to S40 are the same as in Embodiment 4, and will not be repeated here. In this embodiment, in order to avoid the plane mirrors in the reference folding mirror group and the off-axis folding mirror group from blocking each other's light or the plane mirrors being too small, spaced, or too high, causing light to be blocked, the rationality of the structural parameters of the reference slit optical path and the off-axis slit optical path after adding the slit reconstruction structure is determined based on the integrity of the exit pupil.

[0159] In practice, the known off-axis distance of the target needs to be compressed to a position of lns (along the Y direction), by constructing an optimization function equation. Calculate the parameters of a set of reference folding lens groups, including ( Then, based on the first and third constraints, the exit angle of the off-axis slit optical path (positive-order slit optical path) to the image plane is calculated. Further construct the optimization function equation. Solving for the structural parameters of the positive order folding mirror group includes ( ).

[0160] (20)

[0161] (twenty one)

[0162] The following is a further explanation of the specific implementation. If the multi-slit optical path reconstruction system does not include the multi-slit reconstruction module, the off-axis distance between the off-axis slit optical path and the reference slit optical path is 76mm. After adding the multi-slit reconstruction module, the off-axis distance lns between this off-axis slit optical path and the reference slit optical path (optical axis) is compressed to 3.91mm.

[0163] First we establish The optimization function calculates the counterclockwise rotation angles of the first and second plane mirrors relative to the optical axis using an iterative algorithm. =40° =45°; the clockwise rotation angles of the third and fourth plane mirrors relative to the optical axis are respectively... =45° =40°; =37mm =34mm; determined according to the third constraint condition. =17.276mm, =37.571mm, =34.525mm; because =15 mm (which is known) and the optical path of the reference slit without the multi-slit reconstruction module is 115.0286 mm, therefore we get =10.6566mm. Simultaneously obtained... = 6.524 mm, =17.014 mm, = 5.995 mm, yielding a back intercept (BFL) of 55.1896 mm. Therefore, the positional relationship between the first and fourth plane mirrors is determined, and the exit pupil distance of the reference slit optical path after folding is also determined to be 224 mm. The exit pupil of the reference slit optical path is thus determined to be located at a negative 224 mm (the distance is an absolute value). Therefore, according to the first constraint condition, we can obtain... It is 1°, because it is known that... If the angle is 1°, then according to the second constraint condition, We establish the optimization function. Calculated through an iterative algorithm , , Therefore, the calculation yields... And the corresponding calculations are as follows:

[0164] ;

[0165] The initial structural values ​​of each slit were applied to a multi-angle-slit reconstruction hyperspectral imager system, and its practicality was simulated using Zemax. The back working distance of the front telescope objective in the folded optical path is 128 mm, and the off-axis distance between the off-axis slit optical path and the reference slit optical path is 76 mm. The back working distance of the rear telescope objective in the folded optical path is 55.1896 mm, and the off-axis distance is 3.91 mm. Figure 8 Each slit has a spectral broadening of 2.45 mm, and we have reserved an additional 1.46 mm of space to prevent spectral images from overlapping within the same slit array.

[0166] according to Figure 9The integrity of the exit pupil is assessed to ensure that light rays from different structures are not obstructed. These different structures correspond to positive-order folding lens groups, negative-order folding lens groups, and a reference folding lens group, respectively. Simulation results demonstrate the practicality and effectiveness of this method, enabling the simultaneous acquisition of spectral information from multiple separation angles using a single lens and without moving parts. Furthermore, it achieves compatibility with both long focal lengths and large-angle separation fields of view, even with increased orbital altitude.

[0167] Example 6

[0168] Accordingly, according to embodiments of the present invention, the present invention also provides a computer device, a readable storage medium, and a computer program product.

[0169] Figure 10 This is a schematic diagram of the structure of a computer device 62 provided in an embodiment of the present invention. Figure 10 A block diagram of an exemplary computer device 62 suitable for implementing embodiments of the present invention is shown. Figure 10 The computer device 62 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention.

[0170] like Figure 10 As shown, computer device 62 is represented in the form of a general-purpose computing device. Computer device 62 is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic devices may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0171] The components of computer device 62 may include, but are not limited to: one or more processors or processing units 66, system memory 78, and bus 68 connecting different system components (including system memory 78 and processing unit 66).

[0172] Bus 68 represents one or more of several bus architectures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. Examples of these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnect (PCI) bus.

[0173] Computer device 62 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by computer device 62, including volatile and non-volatile media, removable and non-removable media.

[0174] System memory 78 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 80 and / or cache memory 82. Computer device 62 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 84 may be used to read and write non-removable, non-volatile magnetic media (…). Figure 10 Not shown; usually referred to as a "hard drive"). Although Figure 10 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk") and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 68 via one or more data media interfaces. System memory 78 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present invention.

[0175] A program / utility 90 having a set (at least one) of program modules 92 may be stored, for example, in system memory 78. Such program modules 92 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. Program modules 92 typically perform the functions and / or methods described in the embodiments of the present invention.

[0176] Computer device 62 can also communicate with one or more external devices 64 (e.g., keyboard, pointing device, display 74, etc.), and with one or more devices that enable a user to interact with computer device 62, and / or with any device that enables computer device 62 to communicate with one or more other computing devices (e.g., network card, modem, etc.). This communication can be performed via input / output (I / O) interface 72. Furthermore, computer device 62 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 70. As shown, network adapter 70 communicates with other modules of computer device 62 via bus 68. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with computer device 62, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0177] The processing unit 66 executes various functional applications and data processing by running programs stored in the system memory 78, such as implementing the multi-separation angle slit optical path reconstruction method provided in the embodiments of the present invention.

[0178] This invention also provides a non-transitory computer-readable storage medium storing computer instructions, on which a computer program is stored, wherein when the program is executed by a processor, it implements the method for reconstructing multi-separation angle slit optical paths provided in all embodiments of this invention.

[0179] The computer storage medium of this invention can be any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. More specific examples (a non-exhaustive list) of computer-readable storage media include: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0180] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0181] The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof. The computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer can be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0182] This invention also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method for reassembling multi-separation angle slit optical paths.

[0183] This invention also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method for reassembling multi-separation angle slit optical paths.

[0184] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this invention disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this invention can be achieved, and this is not limited herein.

[0185] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A reconstruction system for multi-separation-angle slit optical paths, characterized in that, It includes a telescope objective module, a multi-slit reconstruction module, and a multi-slit array module arranged sequentially along the optical axis; among which: The telescope objective module is used to capture parallel beams within multiple separate angle fields of view. The multi-slit array module includes reference slits and off-axis slits arranged parallel to each other along the meridional direction; The multi-slit reconstruction module is used to compress the off-axis spacing along the meridional direction between the off-axis slit optical path and the reference slit optical path; the multi-slit reconstruction module includes a reference folding mirror group for folding the reference slit optical path and an off-axis folding mirror group for folding the off-axis slit optical path; Wherein, the off-axis slit optical path is the optical path that exits from the telescope objective module and enters the off-axis slit; the reference slit optical path is the optical path that exits from the telescope objective module and enters the reference slit; The reference folding mirror group includes a first plane mirror, a second plane mirror, a third plane mirror, and a fourth plane mirror defined sequentially according to the order of light propagation; the centers of the first plane mirror and the fourth plane mirror are located on the optical axis and satisfy the formula: in, It is the angle between the first plane mirror and the second plane mirror; It is the angle between the second plane mirror and the third plane mirror; It is the angle between the third plane mirror and the fourth plane mirror; It is the angle between the incident ray from the first plane mirror and the outgoing ray from the second plane mirror; It is the angle between the incident ray from the second plane mirror and the ray emitted from the third plane mirror; It is the angle by which the first plane mirror rotates counterclockwise; It is the angle of the second plane mirror's counterclockwise rotation; It is the angle of clockwise rotation of the third plane mirror; It is the angle of clockwise rotation of the fourth plane mirror.

2. The reconstruction system of multi-separation-angle slit optical paths according to claim 1, characterized in that: The reference folding lens group is used to make the exit pupil center of the reference slit optical path located on the optical axis, and to make the optical path of the principal ray of the reference slit optical path equal before and after folding; The off-axis folding mirror assembly is used to make the distance between the exit pupil center of the off-axis slit optical path and the exit pupil center of the reference slit optical path zero, and to make the optical path length of the principal ray of the off-axis slit optical path equal before and after folding.

3. The reconstruction system of multi-separation-angle slit optical paths according to claim 1, characterized in that, The off-axis folding mirror group includes a fifth plane mirror and a sixth plane mirror defined sequentially according to the order of light propagation; When the fifth and sixth plane mirrors rotate clockwise respectively 1 、 At time 2, the principal ray of the off-axis slit optical path is incident at the sixth plane mirror at an angle of incidence. i 5 (λ 0 ) Satisfying the formula: in, i 4 (λ 0 ) The incident angle of the principal ray of the off-axis slit optical path at the fifth plane mirror; i 6 (λ 0 ) The incident angle of the principal ray of the off-axis slit optical path on the primary image plane; lns The distance from the slit to the axis. L E This is the exit pupil distance.

4. A method for reconstructing a multi-separation-angle slit optical path, applied to the multi-separation-angle slit optical path reconstruction system as described in claim 1, characterized in that, include: S10. Establish the first constraint condition based on the fact that the exit pupil positions of the reference slit optical path and the off-axis slit optical path are consistent. S20. Establish a second constraint condition that enables the off-axis slit optical path to simultaneously satisfy image plane consistency and optical path consistency. S30. Establish a third constraint condition that enables the reference slit optical path to simultaneously satisfy image plane consistency and optical path consistency. S40. Ensure that the structural parameters of the multi-slit reassembly module simultaneously satisfy the first constraint, the second constraint, and the third constraint.

5. The method for reconstructing multi-separation-angle slit optical paths according to claim 4, characterized in that, After step S40, the method further includes step S50: judging the rationality of the structural parameters of the multi-slit reconstruction module based on the integrity of the exit pupil of the reconstructed optical path.

6. The method for reconstructing multi-separation-angle slit optical paths according to claim 4, characterized in that, Step S20 specifically includes: The image plane consistency constraint of the second constraint condition is established based on the fact that the sum of the axial distances of all segments of the off-axis slit optical path is equal to the sum of the axial distances of all segments of the reference slit optical path. The optical path consistency constraint in the second constraint condition is established based on the consistency of the optical path of the off-axis slit optical path before and after being folded by the multi-slit reconstruction module. The plane mirror rotation constraint in the second constraint condition is established based on the change in the incident angle of the off-axis slit optical path caused by the rotation of the fifth and sixth plane mirrors in the multi-slit reconstruction module.

7. The method for reconstructing multi-separation-angle slit optical paths according to claim 4, characterized in that, The specific steps of step S30 include: The image plane consistency constraint in the third constraint condition is established by the total projection length of the reference slit optical path in the optical axis direction. The optical path consistency constraint in the third constraint condition is established by ensuring that the optical path of the reference slit optical path is consistent before and after being folded by the multi-slit reconstruction module. The angle constraint in the third constraint condition is established by setting the offset angle between the incident and outgoing rays of the reference slit optical path relative to the optical axis to 0.

8. A computer device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the method for reassembling the multi-separation angle slit optical path according to any one of claims 4 to 7.

9. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method for reconstructing the multi-separation angle slit optical path according to any one of claims 4 to 7.

Images